
#include <memory.h>
#include <stdio.h>

#include "../include/md5.h"
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21



/* F, G, H and I are basic MD5 functions.
 */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
 */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
 */
#define FF(a, b, c, d, x, s, ac) { \
 (a) += F ((b), (c), (d)) + (x) + (unsigned long int)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define GG(a, b, c, d, x, s, ac) { \
 (a) += G ((b), (c), (d)) + (x) + (unsigned long int)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define HH(a, b, c, d, x, s, ac) { \
 (a) += H ((b), (c), (d)) + (x) + (unsigned long int)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define II(a, b, c, d, x, s, ac) { \
 (a) += I ((b), (c), (d)) + (x) + (unsigned long int)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
static void Encode (unsigned char* output,unsigned long int* input,unsigned int len)
{
  unsigned int i, j;

  for (i = 0, j = 0; j < len; i++, j += 4)
  {
    output[j] = (unsigned char)(input[i] & 0xff);
    output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
    output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
    output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
  }
}

static void Decode (unsigned long int* output,unsigned char* input,unsigned int len)
{
  unsigned int i, j;

  for (i = 0, j = 0; j < len; i++, j += 4)
    output[i] = ((unsigned long int)input[j]) | (((unsigned long int)input[j+1]) << 8) |
                (((unsigned long int)input[j+2]) << 16) | (((unsigned long int)input[j+3]) << 24);
}

static void MD5_memcpy (unsigned char* output, unsigned char* input,unsigned int len)
{
  unsigned int i;

  for (i = 0; i < len; i++)
    output[i] = input[i];
}

static void MD5_memset (unsigned char* output,int value,unsigned int len)
{
  unsigned int i;

  for (i = 0; i < len; i++)
    ((char *)output)[i] = (char)value;
}

static void MD5Transform (unsigned long int state[4],unsigned char block[64])
{
  unsigned long int a = state[0], b = state[1], c = state[2], d = state[3], x[16];

  Decode (x, block, 64);

  /* Round 1 */
  FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
  FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
  FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
  FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
  FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
  FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
  FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
  FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
  FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
  FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
  FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
  FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

  /* Round 2 */
  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
  GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
  GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
  GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
  GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
  GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
  GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

  /* Round 3 */
  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
  HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
  HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
  HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
  HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
  HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
  HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
  HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */

  /* Round 4 */
  II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
  II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
  II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
  II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
  II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
  II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
  II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
  II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
  II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
  II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
  II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
  II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
  II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */

  state[0] += a;
  state[1] += b;
  state[2] += c;
  state[3] += d;

  /* Zeroize sensitive information.
   */
  MD5_memset ((unsigned char*)x, 0, sizeof (x));
}

static void MD5Init(unsigned int count[2], unsigned int state[4], unsigned char PADDING[64])
{
  count[0] = count[1] = 0;
  /* Load magic initialization constants.
  */
  state[0] = 0x67452301;
  state[1] = 0xefcdab89;
  state[2] = 0x98badcfe;
  state[3] = 0x10325476;
  memset(PADDING,0,64);
  PADDING[0] = 0x80;

}

void MD5Update(unsigned char* input,unsigned int inputLen, unsigned int count[2], unsigned int state[4], unsigned char buffer[64])
{
  unsigned int i, index, partLen;

  /* Compute number of bytes mod 64 */
  index = (unsigned int)((count[0] >> 3) & 0x3F);

  /* Update number of bits */
  if ((count[0] += ((unsigned long int)inputLen << 3)) < ((unsigned long int)inputLen << 3))
    count[1]++;

  count[1] += ((unsigned long int)inputLen >> 29);

  partLen = 64 - index;

  /* Transform as many times as possible.
  */
  if (inputLen >= partLen)
  {
    MD5_memcpy((unsigned char*)&buffer[index], (unsigned char*)input,partLen);
    MD5Transform (state,buffer);

    for (i = partLen; i + 63 < inputLen; i += 64)
      MD5Transform (state, &input[i]);

    index = 0;
  }
  else
    i = 0;

  /* Buffer remaining input */
  MD5_memcpy
  ((unsigned char*)&buffer[index], (unsigned char*)&input[i],inputLen-i);

}

void MD5Final (unsigned char digest[], unsigned int count[2], unsigned int state[4], 
			   unsigned char PADDING[64], unsigned char buffer[64])
{
  unsigned char bits[8];
  unsigned int index, padLen;

  /* Save number of bits */
  Encode (bits, count, 8);

  /* Pad out to 56 mod 64.
  */
  index = (unsigned int)((count[0] >> 3) & 0x3f);
  padLen = (index < 56) ? (56 - index) : (120 - index);
  MD5Update (PADDING, padLen, count, state, buffer);

  /* Append length (before padding) */
  MD5Update (bits, 8, count, state, buffer);

  /* Store state in digest */
  Encode(digest,state,16);

  /* Zeroize sensitive information.*/
  //MD5_memset ((unsigned char*)this,0, sizeof(*this));
}

int MD5String(char* szInput, int nLen, char *szOutStr)
{
	int i;
	unsigned int state[4];                          /* state (ABCD) */
	unsigned int count[2];                         /* number of bits, modulo 2^64 (lsb first) */
	unsigned char PADDING[64];
	unsigned char buffer[64];                          /* input buffer */
	unsigned char result[16];
	memset(buffer, 0, 64);
	/*count[0] = count[1] = 0;

	state[0] = 0x67452301;
	state[1] = 0xefcdab89;
	state[2] = 0x98badcfe;
	state[3] = 0x10325476;*/
	memset(PADDING,0,sizeof(PADDING));
	PADDING[0] = 0x80;
	MD5Init(count, state, PADDING);
	MD5Update((unsigned char*)szInput, nLen, count, state, buffer);
	MD5Final(result, count, state, PADDING, buffer);

	for(i=0;i<16;i++)
	{
		sprintf(&szOutStr[0]+i*2,"%02x",result[i]);
	}
	return 0;
}


int MD5StringUpperCase(char* szInput, int nLen, char *szOutStr)
{
	int i;
	unsigned int state[4];                          /* state (ABCD) */
	unsigned int count[2];                         /* number of bits, modulo 2^64 (lsb first) */
	unsigned char PADDING[64];
	unsigned char buffer[64];                          /* input buffer */
	unsigned char result[16];
	memset(buffer, 0, 64);
	/*count[0] = count[1] = 0;

	state[0] = 0x67452301;
	state[1] = 0xefcdab89;
	state[2] = 0x98badcfe;
	state[3] = 0x10325476;*/
	memset(PADDING,0,sizeof(PADDING));
	PADDING[0] = 0x80;
	MD5Init(count, state, PADDING);
	MD5Update((unsigned char*)szInput, nLen, count, state, buffer);
	MD5Final(result, count, state, PADDING, buffer);

	for(i=0;i<16;i++)
	{
		sprintf(&szOutStr[0]+i*2,"%02X",result[i]);
	}
	return 0;
}